The book will be published in the U.K. on May 31, three days following the 110th anniversary of the birth of Ian Fleming. It won’t be available in the U.S. until sometime in the fall. The announcement didn’t specify a date.

Forever and a Day is a prequel to Casino Royale, Fleming’s first Bond novel, according to the announcement.

The new novel will “explore the origins of the world’s most famous secret agent.” One agent 007 is killed and Bond replaces him.

Like Horowitz’s first 007 novel, Trigger Mortis, Forever and a Day includes some previously unpublished Fleming material.

Horowitz has been teasing progress on the new novel on Twitter. He wrote a new post after the title announcement.

FOREVER AND A DAY. I know the news has broken but it feels so great to be able to tweet the words which I’ve been secretly living with.

UPDATE (11:25 a.m. New York time): The author said on Twitter in response to questions he came up with the title Forever and a Day and that IFP approved it. Some of Horowitz’s predecessors as Bond continuation authors suggested titles but saw them rejected.